The MmNi4.22Co0.48Mn0.15Al0.15 (Mm = mixed rare earth metals) compound was synthesized by a vacuum induction melting system under argon atmosphere. The sample was characterized by X-ray diffraction and the scanning electron microscopy with energy dispersive X-ray detector. The structural results show that the sample is single phase with CaCu5 type hexagonal structure, and there is no secondary phase. However, the substitutions at La and Ni site cause the lattice expansion. The Study of surface morphology by scanning electron microscope (SEM) equipped with energy dispersive X-ray (EDX) confirms the homogeneous composition and the existence of any precipitated solid solution phases, in agreement with XRD results. The magnetic measurements result reveals a weak magnetic property at room temperature.

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